A 23-year-old Oakland man will serve six years in prison for kicking a woman in the head after robbing her on Pink Saturday, the day before the annual Pride Parade, in San Francisco last year, prosecutors say.

Christopher Porter-Bailey and two other robbers, also convicted separately in the case, first stole the 28-year-old woman's cell phone and purse and then knocked her to the ground in the Castro on June 30. That was when, San Francisco Assistant District Attorney Alex Bastian said, video surveillance footage shows Porter-Bailey, already on felony probation in connection with an earlier crime, "soccer-kicking her in the head when she tries to get up."

"That's what makes this particularly egregious," he said, adding that the victim was knocked unconscious.

The woman was hospitalized with a concussion and other serious injuries in the assault. In February, a jury convicted Porter-Bailey of robbery, assault and battery with serious injury.

Bastian said that given the defendant's history, prosecutors wanted him sentenced to the maximum eight-year term but Superior Court Judge Julie Tang imposed a six-year term after the sentencing hearing Friday.